Bruises happen, sometimes they hurt, too. And you will sweat too. That is all part of training a martial art. Better to learn how to take some hits in training and not in a real situation for the first time. At the end, we all train a martial art, not only a sport. We rely on the historic and traditional background of our art, and these were and are painful and unforgiven. Although we are not willing to reply the punishment of the old masters towards their students – learning the art will hurt.
“How likely is that you can achieve anything substantial in martial arts if your primary value when you practice is to feel comfortable all the time?
How are you going to manage a fight that you must face?
Even a relatively insignificant strike can become an insurmountable obstacle for a practitioner who’s been training always in a comfortable way and always avoided what’s difficult or disagreeable.
You should seek out and welcome challenges as opportunities to grow.
Each self-imposed uncomfortable training strengthen you.
Day by day, you immunize yourself against different kind of attacks and aggressions, precisely because you seek them out.
When life deals you an unexpected fight, you are ready to handle it because thanks to practicing your training the hard way you're always ready to deal with it.” (PG Fabrizio Mansur)

Translates roughly into “repetitive drill”. Very Basic Partner Drill for teaching you distance, Footwork and Coordination. You need to train pelampas in order to improve your hand and leg movements in receiving attacks from your opponent. It is not an empty drill. Once understood, the atackers attacks randomly & the drill comes alive.
These repetitive exercise should teach you the understandings of distance, correct structure and familiarisarion of attack lines.